title: Primary transitional cell carcinoma of the prostate presenting as a rectal ulcer.
mesh_terms: D002295:Carcinoma, Transitional Cell / Q000150:complications / Q000175:diagnosis*; D006471:Gastrointestinal Hemorrhage / Q000209:etiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D017430:Prostate-Specific Antigen / Q000097:blood; D011471:Prostatic Neoplasms / Q000150:complications / Q000175:diagnosis*; D012002:Rectal Diseases / Q000209:etiology*; D014057:Tomography, X-Ray Computed; D014456:Ulcer / Q000209:etiology*
chemical_list: D017430:Prostate-Specific Antigen